Leases Leases (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Lease, Cost [Abstract]
Fixed costs	$ 8,245	$ 8,302
Variable costs	13	24
Short-term lease costs	92	520
Sublease income	(1,016)	(1,126)
Net lease expense	7,334	7,720
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	8,236	8,242
ROU assets obtained in exchange for lease obligations:
Operating leases	$ 4,560	$ 147,972